10 CFR § 429.24 - Pool heaters.

§ 429.24 Pool heaters.

(a) Sampling plan for selection of units for testing.

(1) The requirements of § 429.11 are applicable to pool heaters; and

(2) For each basic model of pool heater a sample of sufficient size shall be randomly selected and tested to ensure that any represented value of the thermal efficiency or other measure of energy consumption of a basic model for which consumers would favor higher values shall be less than or equal to the lower of:

x = 1 n i = 1 n x i and, x is the sample mean; n is the number of samples; and x i is the i th sample;

(i) The mean of the sample, where:

Or,

(ii) The lower 97 1/2 percent confidence limit (LCL) of the true mean divided by 0.95, where:

L C L = x - t . 975 ( s n ) And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t 0.975 is the t statistic for a 97.5% one-tailed confidence interval with n-1 degrees of freedom (from Appendix A).

(b) Certification reports.

(1) The requirements of § 429.12 are applicable to pool heaters; and

(2) Pursuant to § 429.12(b)(13), a certification report shall include the following public product-specific information: The thermal efficiency in percent (%) and the input capacity in British thermal units per hour (Btu/h).

[76 FR 12451, Mar. 7, 2011; 76 FR 24769, May 2, 2011]

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